JPH08109559A - Laminated nonwoven structure - Google Patents

Abstract

PURPOSE: To provide a laminated nonwoven structure having high tensile strength and delamination strength, excellent softness, dyeability, water absorptivity, oil-absorptivity, lint-freeness and excellent bacteria barrierness. CONSTITUTION: This laminated nonwoven structure is a laminate of a nonwoven cloth composed of mechanically interlocked natural fibers and a nonwoven cloth composed of fibers having three-dimensional network structure, partially bonded with each other by heat-bonding and containing fibrillated fibers made of a polyolefinic polymer and fibrillated fibers made of a polyester polymer as main components. The nonwoven structure has sporadically fused regions where the network structure fibers 1 and the natural fibers 2 are fused with each other. The natural fibers positioned at least on the boundary of both nonwoven layers in the sporadically fused region are fixed in a state embedded in the fused part of the network-structure fibers. The nonwoven structure is suitable as a raw material for medical and sanitary materials, clothes, daily necessities or industrial materials.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a laminated non-woven structure obtained by laminating a reticulated fiber non-woven fabric comprising a polyolefin polymer and a polyester polymer and a natural fiber non-woven fabric. Has excellent peeling strength, flexibility, dyeability, water absorbency and oil absorbency, lint-free property, and excellent bacterial barrier property. The present invention relates to a laminated non-woven structure suitable as a raw material for clothing, clothing, daily life-related materials, or industrial materials.

[0002]

2. Description of the Related Art Conventionally, a laminated non-woven structure is known in which a thermoplastic synthetic fiber nonwoven fabric and a natural fiber nonwoven fabric are laminated. For example, in Japanese Examined Patent Publication No. 54-24506, a breathable heat-welding layer made of a thermoplastic synthetic fiber nonwoven fabric and a breathable non-heat-welding layer made of natural fibers are laminated, and the heat-welding property is formed on the non-heat-welding layer. A laminated non-woven structure having a structure in which substances are arranged in a scattered manner, and a fusion portion of a heat-welding substance and a heat-welding layer penetrates from both sides of the non-heat-welding layer to sandwich and sandwich the non-heat-welding layer. Is proposed. However, this laminated non-woven structure has excellent water absorbency due to the laminated natural fibers, and because the heat-welding layer penetrates into the non-heat-welding layer, that is, the natural fiber layer by the heat-welding treatment, it has good tensile strength and peeling. Although it has excellent mechanical properties such as strength, it has a problem that the texture such as flexibility deteriorates. In addition, this laminated non-woven structure has a step of laminating a breathable heat-welding layer and a breathable non-heat-welding layer, and a heat-sealing sheet layer for impregnation on the non-heat-welding layer. , A step of infiltrating the fused portion of the heat-welding substance and the heat-welding layer from both sides of the non-heat-welding layer by ultrasonic welding to develop a structure in which the non-heat-welding layer is adhesively sandwiched, From the viewpoint of manufacturing technology, such as requiring a step of peeling the weldable sheet leaving the melted portion, it is complicated and economically inferior. On the other hand, in the above-mentioned laminated non-woven structure, two different polymers are arranged in a sea-island type as a thermoplastic synthetic fiber non-woven fabric for the purpose of improving its flexibility and also having a filter property. Nonwoven fabric composed of ultrafine fibers obtained by melt spinning a component filament and removing one polymer with a solvent, or ultrafine fibers obtained by the so-called melt blown method in which a molten polymer is extruded from a spinning hole and pulled at high speed by a hot air flow It is conceivable to use a non-woven fabric. However, the former non-woven fabric starting from a two-component filament requires various complicated steps to dissolve and remove the polymer when it is produced, and the latter non-woven fabric has certain constituent fibers. Although it is an ultrafine fiber, the stretch orientation and crystallization do not proceed sufficiently because the polymer is pulled / thinned in the molten state immediately after discharge during the production of this fiber. Therefore, the strength of the obtained fiber is It does not improve to a practically sufficient level.

[0003]

DISCLOSURE OF THE INVENTION The present invention solves the above problems and provides a laminated non-woven structure in which a reticulated fiber nonwoven fabric composed of a polyolefin polymer and a polyester polymer and a natural fiber nonwoven fabric are laminated. And has high tensile strength and peel strength between layers, excellent flexibility, dyeability,
It has both water absorption and oil absorption, has lint-free property, and has excellent bacterial barrier property.
An object of the present invention is to provide a laminated non-woven structure suitable as a material for sanitary materials, clothing, daily life-related materials, or industrial materials.

[0004]

The present inventors have arrived at the present invention as a result of extensive studies to solve the above problems. That is, the present invention has the following configuration as its gist. Network-structured fibers composed of three-dimensional network-structured fibers whose main constituents are fibril fibers composed of a polyolefin-based polymer and fibril fibers composed of a polyester-based polymer, and the constituent fibers are partially heat-bonded A non-woven fabric and a non-woven fabric in which natural fibers are mechanically entangled with each other are laminated, and there is a point-like fused area formed by fusing the reticulated structure fiber and the natural fiber, and the point-like fused area In the laminated non-woven structure, the natural fibers located at least at the boundary surface of both the non-woven fabric layers are integrally fixed by being fixed in a state of being embedded in the melted portion of the network structure fibers.

Next, the present invention will be described in detail. First, the present invention relates to a non-woven fabric composed of network-structured fibers. The non-woven fabrics have fiber-forming properties, but they are fibril fibers composed of two kinds of polymers that are incompatible with each other, that is, polyolefin fibers. The polymer fibril fibers and the polyester polymer fibril fibers are the main constituent elements, and they are mixed. The polyolefin-based polymer, which is one of the constituent elements of the reticulated structure fiber in the present invention, is mainly composed of fiber-forming low-density polyethylene, linear low-density polyethylene, medium-density polyethylene, high-density polyethylene or ethylene. Is a copolymerized polyethylene, a crystalline polypropylene, or a copolymerized polypropylene in which other components are copolymerized mainly with propylene. The higher the density of these polymers, the better the modulus of the fibril fiber when it is made into fibril fibers, or the feel of the fibril fiber when it is made into a non-woven fabric due to the reduced slimy feel and tackiness, which is preferable. As the polyethylene polymer, the melt index measured by the method described in ASTM-D-1238 (E) is 0.
3 to 30 g / 10 minutes, and the polypropylene-based polymer has a melt flow rate value of 1 as measured by the method described in ASTM-D-1238 (L).
It is preferable to use one having a content of 40 g / 10 minutes or less.
0.3 g of polyethylene polymer melt index
If it is less than / 10 minutes and the melt flow rate value of the polypropylene-based polymer is less than 1 g / 10 minutes, the melt viscosity of the solution obtained by dissolving the polymer in a solvent is remarkably increased and an ultrafine fibril fiber is obtained. Is difficult to do, which is not preferable. On the other hand, when the melt index of the polyethylene-based polymer exceeds 30 g / 10 minutes and the melt flow rate of the polypropylene-based polymer exceeds 40 g / 10 minutes, the degree of polymerization is too low to follow the spinning speed during flash spinning. However, the spun fiber has a short fiber shape or a substantially powdery shape, and even if an ultrafine fibril fiber could be obtained, its strength is not improved, and the fibril fiber has a slimy shape. It is not preferable because the feeling and tackiness are increased and the texture is deteriorated when it is made into a non-woven fabric, and the handling property is deteriorated due to the increase in tackiness.

The polyester polymer, which is another constituent of the reticulated fiber in the present invention, is polyethylene terephthalate, polybutylene terephthalate, or phthalic acid, isophthalic acid, glutaric acid, adipic acid, sulfoisophthalic acid containing these as the main components. Up to 15 mol% of acid components such as diethylene glycol, propylene glycol, 1,4-butanediol, 2,2-bis (4-hydroxyateoxyphenyl) propane, bisphenol A and polyalkylene glycol. It is a polyester-based copolymer copolymerized in the range. This polymer has a fiber-forming property and a relative viscosity of 1.3-0.5 when measured at a polymer concentration of 0.5% by weight and a temperature of 20 ° C. using an equal weight mixture of tetrachloroethane and phenol as a solvent. From 1.6 to a high-viscosity one prepared by solid-state polymerization and having a relative viscosity of about 1.7 can be used. However, if the polymer has a low viscosity of less than 1.3, the polymerization degree is too low to keep up with the spinning speed during flash spinning, and the spun fibers are in the form of short fibers or almost powder. It is not preferable because it has a morphological shape. In the present invention, in any of the above-mentioned polymers, or in a spinning solution prepared by dissolving the polymer in a solvent, a matting agent, a light-proofing agent, a heat-resistant agent, a pigment usually used for fibers, A fiber-opening agent, an ultraviolet absorber, a heat storage agent, a stabilizer and the like can be added as long as the effects of the present invention are not impaired.

As described above, the reticulated structure fiber in the present invention comprises, as main components, the fibril fibers of the polyolefin polymer and the fibril fibers of the polyester polymer, and the abundance ratio (weight ratio) of both polymers. 5 to 95 /
95 to 5 are mixed. In this network fiber, when the ratio of the polyolefin polymer to the total weight of the polyolefin polymer and the polyester polymer, that is, the abundance ratio is less than 5% by weight (the polyester polymer exceeds 95% by weight), The strength and modulus of the obtained reticulated structure fiber are reduced, thus the strength of the non-woven fabric itself is reduced, and the lightness is also poor. On the other hand, when the existence ratio exceeds 95% by weight (the polyester-based polymer is less than 5% by weight). ), The modulus of the obtained reticulated structure fiber is reduced, and therefore the nonwoven fabric itself has a low stiffness and a poor feeling of wearing due to the low modulus of the fiber, and a slimy feeling is exhibited due to the polyolefin fluff. Both are not preferable because the dyeability may be reduced. Therefore, in the present invention, the abundance ratio (weight ratio) of the polyolefin polymer and the polyester polymer is 5%.
-95 / 95-5, preferably 15-85 / 85
Set to 15.

In the present invention, the reticulated structure fibers are 0.
The fibril fibers having an equivalent diameter of 01 to 10 μm are continuously aggregated to form a three-dimensional network structure, which has a structure in which the fibers are endlessly spread in a longitudinal direction. It is generally known that fibers made of a mixture of mutually incompatible polymers are easily separated into individual components by physical force. The network fiber in the present invention is composed of two kinds of fibril fibers having a three-dimensional network structure as described above. These fibril fibers are mutually incompatible with polyolefin polymer. Since the mixture with the polyester polymer is formed by separating and fibrillating the individual polymer components during flash spinning, it is composed of extremely fine fibril fibers. Therefore, when a non-woven fabric is formed using the obtained network-structured fibers, it has a dense structure, but the flexibility is improved, and the bacterial barrier property is improved while the moisture permeability is sufficiently retained. As described above, the reticulated structure fiber in the present invention has the above-mentioned two types of fibril fibers as main constituent elements. In the reticulated structure fiber, in addition to these main constituent elements, a polyolefin polymer and a polyester-based polymer are used. There are some fibril fibers composed of a polymer and a fibril fiber composed of a mixture of these two kinds of polymers. In the present invention, the equivalent diameter of the fibril fiber is preferably 0.01 to 10 μm, and particularly, denseness, flexibility or high moisture permeability
If high filterability is required, 0.01-0.1 μm
It is good to do.

The non-woven fabric comprising the above-mentioned network fibers in the present invention preferably has a basis weight of 20 to 200 g / m ² . When the basis weight is less than 20 g / m ² , the adhesive strength of the laminated non-woven structure obtained by laminating and integrating the network structure nonwoven fabric and the natural fiber nonwoven fabric becomes low, while when the basis weight exceeds 200 g / m ² , For example, it becomes difficult to apply the obtained laminated non-woven structure to a field where flexibility is particularly required, or after laminating a natural fiber non-woven fabric on this non-woven fabric, it is fused using an ultrasonic fusing device. Both are not preferable because the processing speed is slowed down or a large amount of ultrasonic energy needs to be supplied when the treatment is integrated. Therefore, in the present invention, the basis weight of this network structure nonwoven fabric is 20 to 20.
And 0 g / m ^2, preferably between 50 to 150 g / m ^2.

The non-woven fabric composed of the network-structured fibers in the present invention can be efficiently produced by the so-called flash spinning method as described in, for example, US Pat. No. 3,227,794. That is, a solution obtained by dissolving the polyolefin polymer and the polyester polymer in a solvent of the same bath under high temperature and high pressure is used as a spinning solution, and a pressure drop chamber is provided while further pressurizing the solution above the autogenous pressure. It is spun into the atmosphere through the spinning holes and the solvent is instantly vaporized immediately after spinning to form a reticulated fiber structure.
As a solvent used for preparing a solution, benzene,
Aromatic hydrocarbons such as toluene, butane, pentane, hexane, heptane, octane or aliphatic hydrocarbons such as isomers or homologs thereof, alicyclic hydrocarbons such as cyclohexane, methylene chloride, carbon tetrachloride, chloroform , 1, 1
-Dichloro-2,2 difluoroethane, 1,2-dichloro-1,1 difluoroethane, methyl chloride, ethyl chloride, halogenated hydrocarbon such as fluorocarbon, alcohol, ester, ether, ketone, nitrile, amide, sulfur dioxide, disulfide Carbon, unsaturated hydrocarbons such as nitromethane, or mixtures of the solvents mentioned above can be used. Methylene chloride, 1,1-dichloro-2,2 difluoroethane, 1,2-dichloro-1,1 as a solvent
The use of difluoroethane is preferable because it does not harm the global environment as has been observed when conventional freon is used as a solvent.

When a polyethylene polymer is used as the polyolefin polymer, the melt index measured by the method described in ASTM-D-1238 (E) is 0.3 to. 30 g / 1
When the polypropylene-based polymer is used for 0 minutes, the above-mentioned ASTM-D-123 is used.
It is preferable to use one having a melt flow rate value of 1 to 40 g / 10 minutes or less measured by the method described in 8 (L). Further, as the polyester-based polymer, a polymer concentration of 0.5% by weight and a temperature of 20 ° C. are obtained by using an equal weight mixture of tetrachlorethane and phenol as a solvent.
It is preferable to use a polymer having a relative degree of polymerization of 1.3 or more and a high degree of polymerization as measured by.

Taking into consideration the spinnability in flash-spinning using this spinning solution and the properties of the obtained network-structured fibers, these are the autogenous pressure or nitrogen for the degree of polymerization of the polymer in this spinning solution and the temperature of the solvent. It is difficult to unconditionally specify the concentrations of the polyolefin-based polymer and the polyester-based polymer because it depends on the pressurization state of 1.
It is preferable to use 30% by weight and 95 to 70% by weight of solvent. When the concentration of the total polymer is less than 5% by weight, it is difficult to obtain a network fiber having a continuous structure of fibril fibers, while when the concentration of the polymer exceeds 30% by weight, the concentration of the polymer is increased. Since it is too high and the dissolution becomes non-uniform, it is not possible to obtain ultrafine fibril fibers, and the spun fibers have a hollow structure in which the fibril fibers are joined to each other on their sides and have cavities inside. Since it is not possible to obtain a reticulated structure fiber composed of high-strength fibril fiber as a fiber, neither is preferable. When preparing a spinning solution, all the above-mentioned polymers are used as solutes, these are filled with a solvent in a dissolution apparatus, a solution is prepared while heating and kneading, and the obtained solution is used as a spinning solution. As a melting device,
The most widely used autoclave,
For example, it is possible to use a continuous melting device including an extruder and a kneading device which is arranged continuously from the extruder.

When the spinning solution is heated and kneaded in the dissolution apparatus, the spinning pressure is increased by applying an inert gas such as nitrogen or carbon dioxide having a purity of 99% by weight or more and containing no oxygen. It is preferable because it can be further increased. The gas of nitrogen or carbon dioxide is a so-called inert gas, which is hardly dissolved in the spinning solution used in the present invention and does not adversely affect the polymer, so that a substantial pressure is applied to the spinning solution. be able to.

When the spinning solution is prepared in the dissolving apparatus, a nonionic surface active agent is added to the solution, for example, monoesters of lauric acid, stearic acid, oleic acid, etc., lauryl alcohol, stearyl alcohol and oleyl. Surface active agents such as polyoxyethylene adducts such as alcohols can also be added. By adding this surfactant, the spinning solution can be stably maintained in an emulsified state.

The dissolution time for dissolving all the polymers in the solvent in the dissolution apparatus is preferably 5 to 90 minutes. If the dissolution time for dissolution exceeds 90 minutes,
The thermal decomposition of the polyester-based polymer in the spinning solution is so severe that the strength of the fibril fiber is not improved. On the other hand, if the dissolution time is less than 5 minutes, the dissolution of all the polymers is insufficient and uniform Both are not preferable because it becomes difficult to obtain a reticulated structure fiber made of fibril fiber or the filter is clogged during spinning.

The temperature at which the spinning solution is dissolved, that is, the melting temperature, and the temperature at which the spinning is performed, that is, the spinning temperature, are all such that all the polymer is sufficiently dissolved in the solvent and the spinning solution is flash-spun to produce fine fiber fibers. The temperature is not particularly limited as long as it is a temperature at which the fibers can be aggregated and a fiber having a three-dimensionally reticulated structure can be obtained, but if specified intentionally, the temperature is preferably 170 to 230 ° C. If the melting temperature or the spinning temperature is less than 170 ° C, it is not possible to obtain ultrafine fibril fibers because all the polymers are not uniformly dissolved in the solvent. On the other hand, if the melting temperature or the spinning temperature exceeds 230 ° C, However, the thermal decomposition of the polyolefin-based polymer and the polyester-based polymer does not improve the strength of the obtained fibril fiber, and coloring occurs even if the strength is maintained, both of which are not preferable.

The pressure for flash-spinning the spinning solution depends on the concentration of all polymers, the amount of solvent, the amount of nitrogen injected, etc., but is not limited to any particular value.
It is preferably set to 120 kg / cm ² . The strength of the fiber is expressed by the fact that the polymer molecular chain itself is sufficiently stretched and oriented. Therefore, the flash spinning method, that is, the spinning solution is spun through a spinning hole having a pressure drop chamber,
In the method of instantaneously vaporizing the solvent immediately after spinning to form a reticulated fiber structure, this stretching / orientation is performed by the explosive force that accompanies the instantaneous vaporization of the solvent immediately after spinning. This explosive force is the vaporization force when the solvent is instantaneously vaporized,
Usually, it means the force at which the solvent evaporates at once in 0.1 second or less. Therefore, this spinning pressure is 40 kg
/ Cm ² or more, spinning pressure is 40 kg
If it is less than / cm ² , the explosive force at the time of flash-spinning using a spinning solution is reduced, the orientation of the fibril fibers is insufficient, the strength is not improved, and the spinning state is not uniform. It becomes difficult to stably obtain highly fibrillated reticulated structure fibers, while the pressure is 12
When it exceeds 0 kg / cm ² , the viscosity of the polyester-based polymer in the spinning solution is lowered and the strength of the fibril fiber is not sufficiently improved, either of which is not preferable.

In the present invention, the non-woven web made of the network-structured fibers obtained as described above is partially heat-bonded to maintain its shape. A publicly known method can be adopted when performing the partial heat-bonding treatment. For example, there is a method in which the obtained nonwoven web is passed between both rollers consisting of a heated embossing roller and a metal roller having a smooth surface, or a method using an ultrasonic fusing device. When adopting this partial heat-bonding treatment method, it is preferable to employ a mild treatment condition in order to effectively make the fusion-bonding treatment performed after the lamination of the network-structured fiber nonwoven fabric and the natural-fiber nonwoven fabric. For example, when a heated embossing roller is used, the surface temperature of the roll is 5 to 40 ° C. lower than the melting point of the polymer having the lowest melting point in the network fiber, and the linear pressure of the roll is 0.5 to 50 kg / It is preferred to form a mild pseudo partial thermal bond area as cm. When the difference between this temperature and the melting point of the polymer is more than 40 ° C. and the linear pressure is less than 0.5 kg / cm, the heat-bonding treatment effect is poor and the shape retention of the obtained nonwoven fabric is not improved. Therefore, the strength of the non-woven fabric itself is not improved. On the other hand, when the difference between this temperature and the melting point of the polymer is less than 5 ° C or exceeds the melting point of the polymer and the linear pressure exceeds 50 kg / cm, the partial thermal bonding treatment is performed. Since the effect becomes too large, the reticulated structure fibers are fused in the region other than the partial heat-bonding points, or in the extreme case, the nonwoven fabric is perforated, which is not preferable. When using the ultrasonic fusing device,
A known device, that is, an ultrasonic oscillator generally called a horn having a frequency of about 20 KHz and a pattern roll having convex projections in the form of dots or strips on the circumference is used to measure an object to be processed. It is possible by passing it between the sonic oscillator and the pattern roll. The embossing pattern when using the hot embossing roller or the pattern of the pattern roll when using the ultrasonic fusing device is not particularly limited as long as the pressure contact area ratio is in the range of 4 to 50%, Type, elliptical type, rhombus type, triangular type, T type,
Any shape such as a well shape may be used. The partial heat-bonding process using the hot embossing roller or the ultrasonic fusing device may be a continuous process or a separate process.

Next, regarding the non-woven fabric in which the natural fibers are mechanically entangled with each other in the present invention, the natural fibers constituting the non-woven fabric include, in addition to cellulosic fibers such as cotton fiber and hemp fiber, It also includes animal fibers such as ramie, silk staple fibers, natural pulp, and various recycled staple fibers represented by rayon. In the present invention, as a starting material for the non-woven fabric made of the natural fiber, it is possible to use combed yarn that has not been subjected to bleaching, bleached cotton that has been bleached, or various fluff obtained from a woven or knitted fabric. When using fluff as the starting material, the fluff machine that can be effectively used includes a ratchet machine, a notch breaker, a garnet machine, and a cutting machine. The type and combination of anti-fluffing machines used depend on the shape of the woven or knitted fabric to be fluffed and the thickness or twisting strength of the constituent threads, but multiple identical anti-fluffing machines are connected in series. It is more effective to use two or more types of anti-hairbrushing machine in combination. The defibration rate (%) by the fluffing machine is preferably in the range of 30 to 95%. When the defibration rate is less than 30%, unwoven fibers are present in the card web, so that not only the surface of the non-woven fabric is rough but also natural fibers are three-dimensionally mechanically processed by the high pressure liquid columnar flow treatment. When the entanglement is performed, the high-pressure liquid columnar flow does not sufficiently penetrate the undefibrated fiber portion, and when the defibration rate exceeds 95%, it is laminated with the ultrafine fiber nonwoven fabric.
The laminated non-woven structure obtained by being integrated cannot obtain sufficient surface friction strength, which is not preferable. The defibration rate (%) here is determined by the following equation (1). Disentanglement rate (%) = (weight of woven fabric-weight of filamentous material) x 100 / weight of woven fabric ... (1)

The natural fiber non-woven fabric in the present invention is made of the above-mentioned natural fibers, and the fibers are mechanically entangled with each other. That is, the natural fibers are mechanically entangled by the high-pressure liquid columnar flow treatment or the needle punching treatment. Especially in the former case, the fibers are entangled three-dimensionally and the bulkiness of the non-woven fabric is improved and the flexibility is high. Since the property is also improved, it is more preferable to use, for example, a laminated non-woven structure obtained by laminating and integrating with the above-mentioned network structure nonwoven fabric as a material for sanitary materials or life-related materials.

This non-woven fabric is made of a single material selected from the above-mentioned natural fiber materials or a mixture of plural kinds of materials as a starting material, and a card web having a predetermined weight is prepared by using a card machine. Then, the obtained web can be easily obtained by subjecting the fibers to mechanical entanglement by high pressure liquid columnar flow treatment or needle punching treatment. The card web can be variously selected according to the degree of arrangement of the constituent fibers. For example, a parallel web arranged in the traveling direction of the card machine, a web in which parallel webs are crosslaid, a random web arranged in random, or a medium degree of both. Examples thereof include a semi-random web and the like. Further, when it is desired to develop it as a material for clothing, it is preferable to use a card web in which the aspect ratio of the strength of the nonwoven fabric is about 1/1.

In the case of high-pressure liquid columnar flow treatment, for example, a large number of injection holes having a hole diameter of 0.05 to 1.5 mm, particularly 0.1 to 0.4 mm, are arranged in one row or a plurality of rows with a hole interval of 0.05 to 5 mm. The injection pressure is 5 to 150 kg / c
A method of injecting a high-pressure liquid of m ² G from the injection hole and colliding with a card web placed on the porous support member to give a three-dimensional entanglement between the fibers is adopted. The ejection holes are arranged in rows in a direction orthogonal to the traveling direction of the card web. As the high-pressure liquid, room temperature water or warm water can be used. The distance between the injection hole and the web is preferably 1 to 15 cm. This distance is 1
When the distance is less than 15 cm, the texture of the nonwoven fabric obtained by this treatment is disturbed, while when the distance exceeds 15 cm, the impact force when the liquid flow collides with the laminate is reduced and the three-dimensional entanglement is sufficiently performed. No, neither is preferable. This high pressure liquid columnar flow treatment may be performed in at least two stages. That is, the pressure is 5
A high-pressure liquid flow of -40 kg / cm ² G is jetted to collide with the web to pre-entangle the constituent fibers of the web. In this first stage treatment, the pressure of the liquid flow is 5k
If it is less than g / cm ² G, the constituent fibers of the web cannot be pre-entangled with each other, while the pressure of the liquid flow is 4
When the pressure exceeds 0 kg / cm ² G, when the high-pressure liquid flow is jetted and collided with the web, the constituent fibers of the web are disturbed by the action of the liquid flow, and the web is disturbed in texture and is unsatisfactory. Subsequently, in the second step, a high-pressure liquid flow having a pressure of 50 to 150 kg / cm ² G is jetted to collide with the web, and the fibers constituting the web are three-dimensionally entangled with each other so as to be densely integrated as a whole. . In this second stage treatment, the pressure of the liquid stream is 50
If it is less than kg / cm ² G, the above-mentioned three-dimensional entanglement between fibers cannot be sufficiently formed, while if the pressure of the liquid flow exceeds 150 kg / cm ² G, the resulting nonwoven fabric is obtained. The bulkiness and flexibility are not improved, and both are not preferable. Depending on the basis weight of the web, as a third stage process following the second stage process, the second side process is performed again from the side opposite to the second stage process side under the same conditions as the second stage process. It is possible to obtain a non-woven fabric in which fibers are closely entangled with each other on the front and back. As the porous supporting member for carrying the web used for performing the high-pressure liquid columnar flow treatment, for example, a mesh screen or a perforated plate made of a wire mesh or synthetic resin of 20 to 100 mesh is used as the high-pressure liquid stream. It is not particularly limited as long as it can penetrate. The mesh structure of the porous support member is preferably in the range of 20 fibers / 25 mm to 200 fibers / 25 mm. When it is less than 20 fibers / 25 mm, the fibers become columnar when the high pressure liquid columnar flow collides with the web. As the flow passes through the mesh screen, fibers drop out, while
When the number exceeds 25 mm / column, the amount of energy required for the high-pressure liquid columnar flow to pass through the web and the mesh screen increases and the production cost increases, which is not preferable. After performing the high pressure liquid flow treatment, excess moisture is removed from the treated web. A known method can be adopted for removing the excess water. For example, a nonwoven fabric can be obtained by mechanically removing excess moisture to some extent using a squeezing device such as a mangle roll, and then using a drying device such as a hot band circulation dryer of the saxion band system to remove residual moisture. it can.

The natural fiber nonwoven fabric of the present invention preferably has a basis weight of 30 to 200 g / m ² . When the basis weight is less than 30 g / m ² , the amount of natural fiber present per unit area is too small to provide sufficient water absorption, which is one of the objects of the present invention.
When it exceeds 0 g / m ² , in a laminated non-woven structure obtained by integrating by laminating with the above-mentioned non-woven fabric of network structure and forming point-like fused areas by using an ultrasonic fusing device, peeling thereof Strength is not sufficiently improved, neither of which is preferable. Therefore, in the present invention, the basis weight of this natural fiber nonwoven fabric is set to 30 to 200 g / m ^2, and preferably 50 to
It is set to 150 g / m ² .

Next, the laminated nonwoven structure of the present invention will be described. The laminated non-woven structure of the present invention has a point-like fused area formed by laminating the reticulated structure nonwoven fabric and the natural fiber nonwoven fabric, and fusing the reticulated structure fiber and the natural fiber together,
In addition, the natural fibers located at least at the boundary surface of the two nonwoven fabric layers in the point fusion area are integrated as a whole by being fixed in a state of being embedded in the melting portion of the network structure fiber. . This point-like fusion zone is an ultrasonic fusion zone consisting of an ultrasonic oscillator with a frequency of about 20 KHz, which is usually called a horn, and a pattern roll having convex protrusions in the form of dots or bands on the circumference. Fibers formed by using an apparatus and abutting on the portions corresponding to the convex protrusions are fused to each other. The laminated nonwoven structure of the present invention has a specific area and a specific arrangement of spot-shaped fused areas with respect to the total surface area of the nonwoven structure. Each dot-shaped fused area does not necessarily have to have a circular shape, and may have any shape such as a cross, −, rhombus, T-shape, □ shape, and Δ shape in addition to the circular shape. It is preferable that the ratio (%) of the area of all the dot-like fused regions to the total surface area of the non-woven structure satisfies the range of 4 to 50. When the ratio of the area of all the spot-shaped fused areas to the total surface area of the non-woven structure is less than 4%, the point-shaped fused area is formed by using an ultrasonic fusion device after laminating the reticulated structure fiber nonwoven fabric and the natural fiber nonwoven fabric. In the laminated non-woven structure integrally obtained by forming the attachment area, the peeling strength thereof is not sufficiently improved, while when the area ratio exceeds 50%, the flexibility of the obtained non-woven structure is obtained. And the bulkiness are reduced, both of which are not preferable. Therefore, in the present invention,
The area ratio (%) is 4 to 50, preferably 8 to 25. In addition, it is preferable that the dot-shaped fusion-bonding area has an arrangement density (dots / cm ² ) of 7-80. The arrangement density of the dot-like fused areas is 7 points / cm ²
If it is less than 1, the adhesive strength, that is, the peel strength of the obtained laminated non-woven structure is deteriorated, and also the spots are strongly generated. On the other hand, if the area density exceeds 80 points / cm ² , the obtained laminated non-woven structure is obtained. The flexibility and bulkiness of the structure are reduced, and both are not preferable. Therefore, in the present invention, the area density (points / cm ² ) is set to 7 to 80, preferably 8 to 50.

The ultrasonic fusing device which can be used in the present invention is a known device as described above, that is, a frequency of about 20.
The apparatus is composed of an ultrasonic oscillator, which is usually called a KHz horn, and a pattern roll having a convex projection in a dot shape or a band shape on the circumference. The pattern roll is disposed below the ultrasonic oscillator, and the object to be processed is passed between the ultrasonic oscillator and the pattern roll. The convex protrusions arranged on the pattern roll may be arranged in one row or a plurality of rows, and when the arrangement is a plurality of rows, they may be arranged in parallel or in a staggered arrangement. During the fusion treatment, air pressure is applied to the horn to apply pressure. The linear pressure between the horn and the pattern roll is usually 1 to 10 kg / cm, and when the linear pressure is less than 1 kg / cm, the pressing force against the laminate of the network structure nonwoven fabric and the natural fiber nonwoven fabric is insufficient and melts. No wear occurs, while linear pressure is 10 kg / cm
If the value exceeds the range, the pressure applied to the spot-shaped fused area is too high, and the non-woven fabric having the reticulated structure corresponding to the fused area is thermally decomposed or, in extreme cases, perforated, resulting in a laminated non-woven fabric. The adhesive strength of the structure is reduced, which is not preferable. The laminated non-woven structure of the present invention is obtained by subjecting a laminate of the reticulated structural fiber nonwoven fabric and the natural fiber nonwoven fabric to a fusion treatment using the ultrasonic fusion device described above, thereby forming the Natural fibers located at least at the boundary surface of both non-woven fabric layers are fixed in a state of being embedded in the melted portion of the reticulated structure fiber and integrated as a whole. FIG.
[Fig. 3] is a schematic view showing a cross section of the dot-like fused area in the laminated nonwoven structure of the present invention. In the figure, 1 is a network-structured fiber layer melted in a point fusion area, 2 is a natural fiber, and as is clear from the figure, a natural fiber 2 located at least at the boundary surface of both non-woven fabric layers in the point fusion area 2 Is fixed in a state in which the reticulated structure fibers are melted and embedded in the melted portion, that is, in the state of being embedded in 1. Since both non-woven fabric layers have such an adhesive structure in the dot-shaped fusion zone, not only tensile strength but also delamination strength A high laminated non-woven structure is formed.

[0026]

The laminated non-woven structure of the present invention comprises, on one side, a non-woven fabric composed of a three-dimensional reticulated fiber whose main constituents are fibril fibers made of a polyolefin polymer and fibril fibers made of a polyester polymer. Therefore, it exhibits excellent flexibility, exhibits water absorbency due to the presence of fine fibril fibers and excellent bacterial barrier properties, exhibits oil absorbency and dyeability due to the presence of polyester polymer, and has a partial gap between the reticulated structure fibers. It has a lint-free property because it is heat-bonded, and on the other side it exhibits water absorbability and dyeability because it is composed of a non-woven fabric in which natural fibers are mechanically entangled with each other. In addition, the water absorption is further improved by the synergistic effect of the ultrafine net-structured fibers and the three-dimensional entanglement of the natural fibers. Further, in the point-like fused area formed by fusing the network-structured fibers and the natural fibers, the natural fibers located at least at the boundary surface between the two non-woven fabric layers are fixed in a state of being embedded in the melting portion of the network-structured fibers. Since it has a bonded structure, it is a laminated non-woven structure with high delamination strength.

[0027]

EXAMPLES Next, the present invention will be specifically described based on examples, but the present invention is not limited to these examples. In the examples, each characteristic value was measured by the following method. Melting point of polymer (° C.): measured by using a differential scanning calorimeter DSC-2 type manufactured by Perkin Elma Co., Ltd. with a sample weight of 5 mg and a temperature rising rate of 20 ° C./min. The temperature giving the value was defined as the melting point (° C). Melt index (g / 10 minutes): ASTM-D-1
It was measured by the method described in 238 (E). Melt flow rate value (g / 10 minutes): ASTM-D-
It was measured by the method described in 1238 (L). Relative viscosity: Measured by a conventional method under the conditions of a sample concentration of 0.5 g / 100 cc and a temperature of 20 ° C. using an equal weight mixed solution of phenol and ethane tetrachloride as a solvent. Average single fiber fineness (μm): An electron micrograph of the sample was taken, and the average single fiber diameter was determined from the obtained photo. Unit weight (g / m ² ): 10 cm in length from standard state sample
After making 10 pieces of 10 cm wide sample piece to reach the equilibrium water content, weigh each sample piece (g) and calculate the average value of the obtained values per unit area (m ² ). Unit weight (g /
m ² ). Tensile strength (kg / 5cm width) and tensile elongation (%):
It was measured according to the method described in JIS-L-1096A. That is, a total of 10 sample pieces having a sample length of 10 cm and a sample width of 5 cm were prepared, and a constant speed extension type tensile tester (Tensilon UTM-4 manufactured by Toyo Baldwin Co., Ltd.) was used for each sample piece in the warp and weft directions of the nonwoven fabric. -1-100) was used to stretch at a tensile speed of 10 cm / min, and the average value of the load values during cutting (kg / 5 cm width) obtained was 100 g / m ²
Tensile strength (kg / 5cm)
Width), elongation at break (%) is the average value of tensile elongation (%)
And Delamination strength (g / 5 cm width): A total of 10 sample pieces with a sample length of 10 cm and a sample width of 5 cm were prepared, and a constant speed extension type tensile tester (Toyo Bold Win Tensilon UTM-4-1-10
0) was used to forcibly peel the natural fiber nonwoven fabric layer from the reticulated fiber nonwoven fabric layer to a position of 5 cm from the end of the laminated structure at a tensile speed of 10 cm / min, and the obtained load value (g / 5 cm) was obtained. The average value of the width is the delamination strength (g / 5 cm)
Width). Bending resistance (g): A total of 5 sample pieces with a sample length of 10 cm and a sample width of 5 cm were made, and each piece was bent laterally to form a cylindrical object, and the ends were joined together. The sample was measured for bending resistance. Then, for each measurement sample, the maximum obtained was obtained by compressing in the axial direction using a constant-speed extension type tensile tester (Tensilon UTM-4-1-100 manufactured by Toyo Baldwin Co., Ltd.) at a compression rate of 5 cm / min. The average value of the load values (g) was defined as the bending resistance (g). Therefore, a lower value of this bending resistance means a softer nonwoven fabric. Moisture permeability (g / m ^2/24 hours): JIS-L-1099
According to the method described in A1, the temperature was 40 ° C. and the humidity was 90%. Water pressure resistance (mm water column): Measured according to the high water pressure method described in JIS-L-1092B. Water absorption (mm): Measured according to the Bayrek method described in JIS-L-1096. Dyeability: Nonwoven fabric sample pieces were subjected to the following disperse dyeing or cation dyeing, and successively subjected to the following reducing dyeing. Disperse dye: Blue E-FBL (manufactured by Sumitomo Chemical Co., Ltd.) as a disperse dye
1% owf, Disper-TL (made by Meisei Chemical Co., Ltd.) as a dispersant
Boyle dyeing was performed under the conditions of a bath ratio of 1:50 and a treatment time of 60 minutes, using 1 g / liter and 0.1 g / liter of formic acid as an auxiliary agent, respectively. Cationic dyeing: Astrazon Blue FFR as cationic dye
(Bayer Co.) 1% owf, Migregar WA-10 (Senka Co.) 0.5 g / liter as leveling agent, sodium sulfate 10% owf as auxiliary agent, and bath ratio 1: 5.
Voile dyeing was carried out under conditions of 0 and a treatment time of 60 minutes. Reduction dyeing: 1 mol / liter of Sanmor RL-100 (manufactured by Nikka Kagaku Co., Ltd.), 2 g / liter of hydrosulfite, 1 g / liter of caustic soda as a refining agent, bath ratio 1:50, treatment temperature 80 ° C., treatment time It was carried out under the condition of 20 minutes. Next, each sample piece was washed with water and dried, and then the dyeability of the sample piece was evaluated according to the following four grades. ◎: Very good, ○: Good, △: Slightly good, ×: Poor

Example 1 First, 1000 g of a high-density polyethylene polymer having a melting point of 132 ° C., a density of 0.96 g / cm ³ and a melt index of 0.8 g / 10 min, and a melting point of 256 ° C. and a relative viscosity. Polyethylene terephthalate polymer 1 with 1.4
000 g and [mixing ratio (weight ratio) of high-density polyethylene polymer and polyethylene terephthalate polymer is 50/5.
0], 8000 g of methylene chloride, and isooctyl stearate and isostearyl ester as surfactants were charged in an autoclave. The amount of surfactant added is
Each was 0.2% by weight with respect to the solution. The autoclave was closed, and the internal pressure of the autoclave continued to be 50k.
After injecting nitrogen gas to g / cm ² G, this solution was heated with stirring at an appropriate speed. At this time, the temperature rising time until the internal temperature of the autoclave increased from 100 ° C. to 200 ° C. was 30 minutes. Then, this solution was kneaded at a temperature of 200 ° C. for 10 minutes to obtain a uniform solution. At this time, the internal pressure of the autoclave is 106 kg /
It was cm ² G. Subsequently, at this internal pressure, that is, the spinning pressure of 106 kg / cm ² G, the valve of the autoclave was immediately opened, and the spinning solution was introduced into the atmosphere through the spinning hole having a pressure drop chamber and a hole diameter / hole diameter ratio of 1 and a hole diameter / pore ratio of 1. Spinning out, spinning out a network-structured fiber composed of the polyethylene polymer and polyethylene terephthalate polymer, colliding the spun fiber group on a rotating plate to open the fiber, and collecting it on a moving wire mesh belt. It was deposited into a non-woven web. At this time, the pressure in the pressure drop chamber is 95 kg / cm ² G
Met. Next, the non-woven webs obtained were laminated, and the protrusion-shaped engraved pattern portion having a tip area of 0.6 mm ² had a pressure contact area ratio of 2
Using a hot embossing roller arranged at a density of 5% and a density of 60 points / cm ² and a metal roller having a smooth surface, the processing temperature is set to 1
Processing speed 10 at 25 ° C and linear pressure of 20 kg / cm
Partial heat-bonding treatment is applied at m / min, and basis weight is 40 g / m ²
A non-woven fabric was obtained. The surface of the fibers constituting the obtained non-woven fabric was photographed using an electron microscope, and the surface morphology was observed.
It had a structure in which a large number of fibril fibers mainly composed of 1.0 μm fibril fibers were aggregated and spread in a net shape.

Separately, a non-woven fabric having an average single fiber fineness of 1.5 denier and an average fiber length of 25 mm bleached with cotton was prepared by three-dimensionally entangled cotton fibers. That is, using the bleached cotton as a starting material, the fiber arrangement is random and the basis weight is 40 g / m 2 by a random card machine.
A random card web corresponding to ² was prepared, and then the obtained web was placed on a wire mesh of 70 mesh which moved at a moving speed of 20 m / min and subjected to high-pressure liquid flow treatment. In high-pressure liquid flow processing, injection holes with a hole diameter of 0.1 mm have a hole spacing of 0.6 mm.
Using the high-pressure columnar water stream treatment device arranged in one row, the columnar water stream was made to act in two stages from the position 50 mm above the web. In the first stage treatment, the pressure is 30 kg / cm
² G, the pressure was 70 kg / cm ^{2 in} the second stage treatment.
G. The second stage treatment was performed twice from the front and back of the web. Then, after removing excess water from the treated product using a mangle roll, the treated product was dried using a hot air dryer at a temperature of 100 ° C., and the cotton fibers were densely three-dimensionally entangled. The weight is 40g
A nonwoven fabric of / m ² was obtained. Then, the reticulated fiber nonwoven fabric obtained above and the cotton fiber nonwoven fabric are laminated, and the frequency is 1
An ultrasonic oscillator of 9.5 KHz and convex protrusions in a dot shape on the circumference were arranged at an area ratio (ratio of the area of all convex protrusions to the total surface area of the roll) of 10% and a density of 18 points / cm ^2. Using an ultrasonic fusing device composed of a patterned roll, ultrasonic fusing treatment was performed at a processing speed of 30 m / min and a linear pressure of 1.5 kg / cm to obtain a laminated nonwoven structure. The properties of the resulting laminated nonwoven structure are shown in Table 1.

Example 2 Example 1 except that the high-density polyethylene polymer was 100 g and the polyethylene terephthalate polymer was 1900 g [the mixing ratio (weight ratio) of the high-density polyethylene polymer and the polyethylene terephthalate polymer was 5/95]. A non-woven web was obtained in the same manner as above, and a partial heat-bonding treatment was applied to this to obtain a non-woven fabric having a network structure and a basis weight of 40 g / m ² . Next, using the ultrafine fiber non-woven fabric obtained above, the laminated nonwoven structure was obtained in the same manner as in Example 1 thereafter. The properties of the resulting laminated nonwoven structure are shown in Table 1.

Example 3 Example 1 except that 300 g of high-density polyethylene polymer and 1700 g of polyethylene terephthalate polymer [mixing ratio (weight ratio) of high-density polyethylene polymer and polyethylene terephthalate polymer was 15/85] were used. A non-woven web was obtained in the same manner as in 1. and a laminated non-woven structure was obtained in the same manner as in Example 2. The properties of the resulting laminated nonwoven structure are shown in Table 1.

Example 4 Example 1 except that the high density polyethylene polymer was 1700 g and the polyethylene terephthalate polymer was 300 g [the mixing ratio (weight ratio) of the high density polyethylene polymer and the polyethylene terephthalate polymer was 85/15]. A non-woven web was obtained in the same manner as in 1. and a laminated non-woven structure was obtained in the same manner as in Example 2. The properties of the resulting laminated nonwoven structure are shown in Table 1.

Example 5 Example 1 was repeated except that the high-density polyethylene polymer was 1900 g and the polyethylene terephthalate polymer was 100 g [the mixing ratio (weight ratio) of the high-density polyethylene polymer and the polyethylene terephthalate polymer was 95/5]. A non-woven web was obtained in the same manner as in 1. and a laminated non-woven structure was obtained in the same manner as in Example 2. The properties of the resulting laminated nonwoven structure are shown in Table 1.

Example 6 Instead of the high density polyethylene polymer, the melting point was 162 ° C.,
A crystalline polypropylene polymer having a density of 0.91 g / cm ³ and a melt flow rate value of 4.0 g / 10 min was used, and the mixing ratio (weight ratio) of the polypropylene polymer and the polyethylene terephthalate polymer was 50/50. A non-woven web was obtained in the same manner as in Example 1 except that the above was performed.
A laminated nonwoven structure was obtained in the same manner as in. The properties of the resulting laminated nonwoven structure are shown in Table 1.

Example 7 In place of the polyethylene terephthalate polymer, a polyethylene terephthalate copolymer mainly composed of ethylene terephthalate was copolymerized with 5 mol% of sulfoisophthalic acid, and the melting point was 247 ° C. and the relative viscosity was 1.3. Used,
A nonwoven web was obtained in the same manner as in Example 1 except that the mixing ratio (weight ratio) of the high-density polyethylene polymer and the polyethylene terephthalate copolymer was 50/50. A woven structure was obtained. The properties of the resulting laminated nonwoven structure are shown in Table 1.

Example 8 Instead of the polyethylene terephthalate polymer, the melting point was 2
A polybutylene terephthalate polymer having a relative viscosity of 1.7 at 28 ° C. is used, and the mixing ratio (weight ratio) of the high-density polyethylene polymer and the polybutylene terephthalate polymer is 5
A non-woven web was obtained in the same manner as in Example 1 except that it was 0/50, and thereafter a laminated non-woven structure was obtained in the same manner as in Example 2. The properties of the resulting laminated nonwoven structure are shown in Table 1.

Comparative Example 1 A non-woven fabric was prepared in the same manner as in Example 1 except that only 2000 g of high-density polyethylene polymer [mixing ratio (weight ratio) of high-density polyethylene polymer and polyethylene terephthalate polymer was 100/0] was used. A web was obtained, and thereafter, a laminated nonwoven structure was obtained in the same manner as in Example 1. The properties of the resulting laminated nonwoven structure are shown in Table 2.

Comparative Example 2 A nonwoven web was prepared in the same manner as in Example 1 except that only 2000 g of polyethylene terephthalate polymer [mixing ratio (weight ratio) of high density polyethylene polymer and polyethylene terephthalate polymer was 0/100] was used. After that, a laminated non-woven structure was obtained in the same manner as in Example 1. The properties of the resulting laminated nonwoven structure are shown in Table 2.

Comparative Example 3 A hot embossing roll having a pressing area ratio of 10% and a hot metal roll having a smooth surface were used in place of the ultrasonic fusing device, the treatment temperature was 125 ° C., the linear pressure was 50 kg / cm, and the processing speed was. 1
Example 1 except that the partial hot-pressing treatment was performed at 0 m / min.
A laminated nonwoven structure was obtained in the same manner as in. The properties of the resulting laminated nonwoven structure are shown in Table 2.

Comparative Example 4 Melting point was 161 ° C. and Flute flow rate value was 200 g / 1.
A nonwoven fabric was produced by a melt blown method using a crystalline polypropylene polymer for 0 minutes. That is, the polymer is melted and spun at a spinning temperature of 280 ° C. and a total discharge rate of 30 g / min from a spinning device equipped with a spinneret having a pore diameter of 0.15 mm and a number of pores of 200, and melt-spun polymer stream. Was pulled and thinned by a high-speed air flow. As this high-speed air stream, heated air having a temperature of 310 ° C. and a flow rate of 170 m / sec was used. Following drawing and thinning, the polymer stream was cooled to form fibers, which were then collected and deposited on a saxion drum 10 cm away from the spinneret to obtain a nonwoven web. This was partially heat-bonded in the same manner as in Example 1 to obtain a meltblown nonwoven fabric having a basis weight of 40 g / m ² . Then, the melt-blown nonwoven fabric obtained above was used to obtain a laminated nonwoven structure in the same manner as in Example 1 thereafter. The properties of the resulting laminated nonwoven structure are shown in Table 2.

Examples 9 to 14 The area ratio of the convex projections on the pattern roll in the ultrasonic fusing device was 2% (Example 9), 4% (Example 10), 16
% (Example 11), 20% (Example 12), 50% (Example 13) and 55% (Example 14), except that the laminated nonwoven structure was obtained in the same manner as in Example 1. . The properties of the resulting laminated nonwoven structure are shown in Table 3.

[0042]

[Table 1]

[0043]

[Table 2]

[0044]

[Table 3]

The laminated non-woven structures obtained in Examples 1 to 8 and 10 to 13 have high tensile strength and high delamination strength as shown in Table 1, excellent flexibility and dyeability. Then
In addition, it possessed both water absorbency and oil absorbency, and also had excellent bacterial barrier properties. In the laminated non-woven structure obtained in Example 5, the content of the polyethylene terephthalate polymer in the reticulated structure fiber was low, and thus the dyeability was slightly deteriorated. The laminated non-woven structure obtained in Example 10 had an area ratio of the convex projections on the pattern roll of 4% in the ultrasonic fusing device, which was the total point fusion to the total surface area of the non-woven structure. Since the area ratio of the area is low, the delamination strength is slightly lower than that of Example 1, and the laminated nonwoven structure obtained in Example 13 has the same area ratio of 50%. The delamination strength was excellent, but the flexibility was slightly inferior to that of Example 1, because the ratio of the area of all the spot-shaped fused regions to the total surface area of the non-woven structure was high. Furthermore, in the laminated nonwoven structure obtained in Example 9, the area ratio of the convex protrusions on the pattern roll in the ultrasonic fusing device was 2%, and the total point fusion to the total surface area of the nonwoven structure was performed. The tensile strength and delamination strength were both low because the area ratio was too low. Example 1
The laminated non-woven structure obtained in No. 4 had the same area ratio of 55% and the ratio of the area of all spot-shaped fused areas to the total surface area of the non-woven structure was too high. Although it was high, it had a high bending resistance and a hard texture.

On the other hand, in the laminated non-woven structure obtained in Comparative Example 1, since the reticulated structure fiber was composed of polyethylene polymer only, the dyeability on the reticulated structure fiber nonwoven fabric side was poor. . The laminated nonwoven structure obtained in Comparative Example 2 was
Although the dyeability was good because the network fibers consisted of polyethylene terephthalate polymer only, the fibrillation of the network fibers was insufficient and the tensile strength was poor. The laminated non-woven structure obtained in Comparative Example 3 was subjected to partial thermocompression treatment using a hot embossing roller instead of the ultrasonic fusing device, and therefore had extremely low delamination strength. there were. Furthermore, Comparative Example 4
The laminated non-woven structure obtained in the above step was one in which a melt-blown fiber non-woven fabric was laminated in place of the reticulated fiber non-woven fabric, and although it had excellent moisture permeability, it had low tensile strength and low water pressure resistance.

[0047]

The laminated non-woven structure of the present invention is composed of a three-dimensional reticulated fiber having fibril fibers made of a polyolefin polymer and fibril fibers made of a polyester polymer as main constituent elements, and A point in which a network-structured fiber nonwoven fabric in which constituent fibers are partially heat-bonded and a non-woven fabric in which natural fibers are mechanically entangled with each other are laminated, and the network-structured fiber and the natural fiber are fused together. Has a fusing zone, and the natural fibers located at least at the boundary surface of both nonwoven fabric layers in the point fusing zone are fixed in such a state that they are embedded in the fused part of the reticulated structure fiber, thereby forming an integral body as a whole. It has high tensile strength and delamination strength, excellent flexibility, and has dyeability.
It has both water absorption and oil absorption, has lint-free property, and has excellent bacterial barrier property.
It is suitable as a material for sanitary materials, clothing, life-related materials, or industrial materials.

[Brief description of drawings]

FIG. 1 is a schematic view showing a cross section of a dot-like fused area in a laminated nonwoven structure of the present invention.

[Explanation of symbols]

 1: Network structure fiber layer melted in a dot-like fusion zone 2: Natural fiber

Claims (6)

[Claims] 1. A three-dimensional reticulated fiber having fibril fibers made of a polyolefin polymer and fibril fibers made of a polyester polymer as main constituents, and the constituent fibers are partially heat-bonded to each other. And a non-woven fabric in which the natural fibers are mechanically entangled with each other are laminated to have a point-like fused area formed by fusing the network-structured fibers and the natural fibers, and Laminates characterized by being integrated as a whole by fixing the natural fibers located at least at the boundary surface of both non-woven fabric layers in the dotted fusion area in a state of being embedded in the fusion portion of the network structure fibers. Non-woven structure. 2. The laminated nonwoven fabric according to claim 1, wherein the polyolefin polymer is any one of a polyethylene polymer or a copolymer thereof, a polypropylene polymer or a copolymer thereof, or a mixture of these polymers. Structure. 3. The polyester polymer is any one of a polyethylene terephthalate polymer or a copolymer thereof, a polybutylene terephthalate polymer or a copolymer thereof, or a mixture of these polymers. The laminated nonwoven structure described. 4. The abundance ratio (weight ratio) of the polyolefin polymer and the polyester polymer is 5 to 95/95 to 5.
The laminated non-woven structure according to claim 1, 2, or 3. 5. The network-structured fiber is composed of a fibril fiber having a diameter equivalent to 0.01 to 10 μm.
Or the laminated nonwoven structure according to item 4. 6. In a point-like fused area formed by fusing a network-structured fiber and a natural fiber, the ratio (%) of the area of all the point-like fused areas to the total surface area of the non-woven structure is 4 to 50. The laminated nonwoven structure according to claim 1, 2, 3, 4, or 5.